Inconsistent naming of block states for the modes of structure blocks and test blocks

The Bug:

Inconsistent naming of block states for the modes of structure blocks and test blocks.

Structure blocks refer to their mode state as "mode" while test blocks refer to their mode state as "test_block_mode". This is inconsistent.

Steps to Reproduce:

1. Summon both a structure block and a test block using the command provided below.

   /setblock ~1 ~ ~1 minecraft:structure_block

   /setblock ~1 ~ ~1 minecraft:test_block

2. Enable the F3 debug screen and look at the block states of both of the blocks.

Observed Behavior:

There is inconsistent naming of block states for the modes of structure blocks and test blocks.

Expected Behavior:

The naming of block states for the modes of structure block and test blocks would be consistent.